Battery system and slave battery management system

A slave battery management system included in a battery pack comprising a metal housing capable of accommodating a plurality of battery modules, the slave battery management system comprising:

• a first communication unit configured to receive a signal from a plurality of other slave battery management systems arranged in the metal housing;
• a second communication unit configured to receive a signal from a master battery management unit arranged outside the metal housing;
• a communication control unit configured to individually control the first communication unit and the second communication unit so that:
• the second communication unit transmits a signal received from the plurality of other slave battery management systems to the master battery management system;
• and
• the first communication unit transmits a signal received from the master battery management system to at least one of the plurality of other slave battery management systems;
• and
• a battery management unit configured to manage at least one of the plurality of battery modules,
• wherein the slave battery management system is installed at a boundary of the metal housing.

A communication method by a slave battery management system installed at a boundary of a metal housing of a battery pack, the metal housing accommodating a plurality of battery modules, the communication method comprising:

• measuring a state of at least one of the plurality of battery modules;
• transmitting/receiving a signal to/from each of a plurality of other slave battery management systems installed in the metal housing;
• and
• transmitting/receiving a signal to/from a master battery management system installed outside the metal housing,
• wherein, when transmitting a signal to the master battery management system, a signal received from the plurality of other slave battery management systems and a signal related to the measured state are transmitted together.